<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>主轴学习二</title>
    <style>
        .box{
            width: 600px;
            height: 500px;
            border: #888888 1px solid;
            display: flex;
            /*起点对齐*/
            /*justify-content: flex-start;*/


            /*终点对齐*/
            /*justify-content: flex-end;*/


            /*居中对齐*/
            /*justify-content: center;*/


            /*均匀分布，两端是中间距离的一半*/
            /*justify-content: space-around;*/


            /*均等分，两端对齐（最常用）*/
            /*justify-content: space-between;*/


            /*均等分，两端距离与中间距离一致*/
            justify-content: space-evenly;
        }
        .box1{
            width: 90px;
            height: 150px;
            border: black 1px solid;
        }
        .box2{
            width: 100px;
            height: 200px;
            border: black 1px solid;
        }
        .box3{
            width: 110px;
            height: 100px;
            border: black 1px solid;
        }
    </style>
</head>
<body>
<!--

-->
        <div class="box">
            <div class="box1">1</div> <div class="box2">2</div> <div class="box3">3</div>
        </div>
</body>
</html>